ui: version-display via JS, undo-toast centering, ctrl+enter save, test progress polish

* version: every span that shows v<APP_VERSION> in the page chrome now
  carries data-app-version, and checkAuth() patches them in from the
  /api/auth/status response so the GUI version doesn't go stale when
  PHP is cached behind anything that revalidates lazily.

* undo: tailwind v4 compiles `-translate-x-1/2` to the *new* CSS
  `translate` property, which then stacks with the inline `transform`
  the toast set — the box ended up shifted ~ -100% and looked left-
  anchored. Drop the tailwind utility, set `translate` directly inline
  so there's one source of truth for the offset.

* editor: ctrl/cmd+enter while the editor modal is open now invokes
  saveCard() (= save + close), pairing with the existing ctrl+s
  (save only) and ctrl+shift+s (save+close) shortcuts.

* collab buckets: drop the inset left edge from .bucket-tab-collab and
  the matching pulse-keyframe shadow — the bar tab now reads as a
  normal bucket tab, just with the unread dot + 3-cycle pulse on update.

* collab create dialog: drop the box border / background from
  .collab-toggle-row and .collab-members so the toggle and the user
  list sit directly on the modal background instead of looking like
  nested input boxes.

* test progress strip: ensureProgressBar() now also pushes the body
  down by 30px AND shrinks it via height: calc(100vh - 30px) so the
  fixed-top bar doesn't clip the footer (body is h-screen +
  overflow-hidden in the core layout). hideProgress() clears both
  inline styles when the run finishes.

chore: bump version to 0.9.2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/plugins/tests/runner.js

@@ -234,6 +234,11 @@ function updateProgress(current, total, name, failed) {
 }
 function hideProgress() {
     getProgressBar()?.remove();
+    // ensureProgressBar() in loader.js pushed the document down by 30px and
+    // shrunk it by the same amount so the footer wouldn't get clipped.
+    // Restore both inline overrides here.
+    document.body.style.marginTop = '';
+    document.body.style.height = '';
 }
 
 async function runAll() {